Locomotive truck

Claim 1

A RAILWAY VEHICLE TRUCK COMPRISING THREE WHEEL AND AXLE ASSEMBLIES SPACED APART LENGTHWISE OF THE TRUCK, A TRUCK FRAME SUPPORTED THEREFROM AND INCLUDING TRANSVERSELY SPACED LONGITUDINALLY EXTENDING SIDE MEMBERS POSITIONED OUTBOARD SAID WHEELS AND A TRANSVERSE TRANSOM INTERMEDIATE THE MIDDLE ASSEMBLY AND EACH END ASSEMBLY, A GENERALLY RECTANGULAR BOLSTER ELONGATED LONGITUDINALLY OF THE TRUCK AND COMPRISING TRANSVERSELY SPACED LONGITUDINALLY EXTENDING SIDE MEMBERS LOCATED TRANSVERSELY INBOARD OF SAID MIDDLE ASSEMBLY WHEELS AND LONGITUDINALLY SPACED TRANSVERSELY EXTENDING END MEMBERS POSITIONED ADJACENT SAID TRANSOMS AND LONGITUDINALLY INBOARD THEREOF, THE REGION DEFINED BY SAID BOLSTER SIDE AND END MEMBERS BEING SUBSTANTIALLY WHOLLY OPEN, SAID BOLSTER BEING RESILIENTLY SUPPORTED FROM SAID FRAME ADJACENT THE INTERSECTIONS OF SAID BOLSTER SIDE AND END MEMBERS, TRANSVERSELY AND LONGITUDINALLY SPACED HORIZONTAL UPWARDLY FACING BEARING SURFACES BEING PROVIDED ON SAID BOLSTER ABOVE ALL THE SUPPORTS THEREOF FROM SAID FRAME, SAID UPWARDLY FACING BEARINGS EACH HAVING AN ARCUATE UPRIGHT WALL CURVED ABOUT A VERTICAL AXIS AT THE CENTER OF THE BOLSTER AND ADAPTED FOR ENGAGEMENT WITH COOPERATING ARCUATE SURFACES ON STRUCTURE DEPENDING FROM THE VEHICLE UNDERFRAME, SAID ARCUATE UPRIGHT WALLS BEING ELONGATED TRANSVERSELY OF THE TRUCK, SAID BOLSTER SIDE MEMBERS MOUNTING, IN SUBSTANTIAL TRANSVERSE ALIGNMENT WITH ITS CENTER, UPRIGHT ADDITIONAL BEARINGS COMPRISING ARCUATE WALLS CURVED ABOUT A COMMON VERTICAL AXIS AT THE BOLSTER CENTER AND ADAPTED TO ENGAGE MATING BEARING ELEMENTS ON THE VEHICLE UNDERFRAME FOR PREVENTING RELATIVE LATERAL MOVEMENT BETWEEN SAID BOLSTER AND SAID SUPPORTED UNDERFRAME.